What is a DMZ network and what types of systems would you expect to find on such networks What is the difference between an internal and an external firewall

A DMZ (Demilitarized Zone) network is a separate network that sits between an organization's internal network and the internet. It is used to provide an additional layer of security by isolating public-facing systems such as web servers, email servers, and DNS servers from the internal network. The systems that are typically found on a DMZ network are those that are accessible to the public, such as web servers, email servers, and DNS servers.

An internal firewall is used to protect the internal network from unauthorized access and to control traffic between different parts of the internal network. It is typically placed at the perimeter of the internal network and is used to filter traffic coming in from the internet.

An external firewall is used to protect the internal network from attacks originating from the internet. It is typically placed at the perimeter of the network and is used to filter traffic coming in from the internet before it reaches the internal network. The main difference between the two is that an internal firewall is used to control traffic within the network, while an external firewall is used to control traffic coming in from outside the network